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  • 78.60  (1)
  • 79.40  (1)
  • stress measurements  (1)
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  • 1
    Digitale Medien
    Digitale Medien
    Deformation enhanced photoemission from aluminum (1977)
    Springer
    Applied physics 12 (1977), S. 301-310 
    Details
    ISSN: 1432-0630
    Schlagwort(e): 78.60 ; 79.40 ; 81
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Notizen: Abstract Measurement of the photoyield of flexurally fatigued aluminum is reported as a function of photon energy for two different initial microstructures of the material. It was found that for photon energies less than about 9 eV fatigue enhances the photoemission. It was also observed that this “photo-stimulated exoelectron emission” is quite sensitive to the initial microstructure. The enhancement occurs much more rapidly with fatigue for well-annealed Al than for work hardened specimens. The results appear to be consistent with a model, to be presented in Part II which is based on a resonant coupling between the surface electromagnetic modes (plasmons) of the metal and the incident photon. This resonance is made possible by the development of dislocation slip steps on the surface during fatigue. The effect of material condition is shown to be primarily a difference in the kinetics of slip step formation. The effects of ion sputtering to remove oxides and of the angle of incidence of the photons are also reported. Above 9 eV the photoyield was found to be almost insensitive to fatigue, usually decreasing slightly.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00886030
    Standort Signatur Erwartet Verfügbarkeit
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    Artikel (Nationallizenzen)
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  • 2
    Digitale Medien
    Digitale Medien
    Ultrasonic reflection from a stressed interface (1984)
    Springer
    Journal of nondestructive evaluation 4 (1984), S. 3-12 
    Details
    ISSN: 1573-4862
    Schlagwort(e): Ultrasonic ; stress measurements ; interfacial stress ; NiTi ; NDE
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Mathematik
    Notizen: Abstract In seeking to develop an NDE technique for verifying the serviceability of NiTi couplers for plumbing unions, it was found that the reflection coefficient for a normally incident ultrasonic wave correlated with the stress level at the NiTi-tubing interface. Current theory pertaining to interface reflection is not complete but, even at present status, there is semiquantitative accord between theoretical predictions and normalized data for reflection coefficient versus stress level. These results are at fixed frequency and with comparable surface roughness. Variation of either frequency or surface roughness further affects the reflection coefficient. Current studies are being pursued to define this effect.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00711095
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
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